Issues with external occultation of a coronagraph

被引：0

作者：

A. Raja Bayanna

Shibu K. Mathew

K. Sankarasubramanian

P. Venkatakrishnan

J. Singh

B. R. Prasad

机构：

[1] Udaipur Solar Observatory,Physical Research Laboratory

[2] ISRO Satellite Center,Space Astronomy & Instrumentation Division

[3] Indian Institute of Astrophysics,undefined

来源：

Experimental Astronomy | 2011年 / 29卷

关键词：

Solar coronagraph; Coronagraph; Occultation; Vignetting; ZEMAX;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

This paper addresses some of the issues related to externally occulted solar coronagraph; vignetting and achievable resolution due to an external occulter. The analytical expression by Evans (J Opt Soc Am 38:1083–1085, 1948) is used to perform the initial calculations. An expression for the vignetting for a given external occulter and field angle is derived. The values obtained with the derived expression are verified with those obtained by ZEMAX an Optical design software. The degradation in angular resolution of the system due to vignetting is also presented and an empirical relation to calculate the normalized resolution for a given amount of vignetting is obtained.

引用

页码：145 / 153

页数：8

共 17 条

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